Yellow Quill duns arrive at the surface as a dun. The nymphs emerge below the surface somewhere between the bottom and the surface. They don't stay on the water very long. They dry their wings and head for the banks, trees and grass. As we have said in previous articles, the duns hatch in pocket water and smooth flowing streams with fast water. They emerge in calmer water such as pockets and then quickly get caught up in the current seams and taken downstream.

Presentation:We use an up and slightly across presentation of our "Perfect Fly" Yellow Quill Dun. Fish it in the current seams coming down the side of pockets behind boulders and to the sides of pockets along the banks. The duns may not surface until they are well below the pockets, so don't fail to fish the dry fly downstream of the pockets. Just follow the bubbles. The ends of long runs are sometimes productive. In smooth, fast flowing water, you want to fish the current seams created by objects and grass in the water.